Mock paper 1 questions

Question 1

Why is it better to use a cable with low resistance than high resistance?

Answer 1

• more efficient

- less energy dissipated

Question 2

What happens to the current if you increase the the temperature of the resistor?

Answer 2

• current increases

- as resistance decreases

Question 3

Explain why the temperature of the heating element increased?

Answer 3

• electrons collide with particles in heating element

- KE of particles increase

Question 4

Suggest why the line didn’t go through the origin?

Answer 4

-heat element took time to heat up

Question 5

Why did the results give a non linear pattern?

Answer 5

• as mass of water In kettle increases

- energy transfer to surroundings decreases

Question 6

Explain why the count rate was less than the activity of the sample?

Answer 6

• radiation spreads in all directions

- only some of gamma radiation passing into tube is detected

Question 7

radiation- explain why the teacher stood as far away from the apparatus as possible

Answer 7

• reduce irradiation

- reduce amount of radiation received

Question 8

As person moves down zip wire increase in kinetic energy is less than decrease in gpe…why?

Answer 8

• friction

- thermal energy transferred to surroundings

Question 9

Explain how motion of air molecules caused pressure in container to change as temp decreased?

Answer 9

• KE of air molecules decreases
• fewer collisions with container walls
• pressure decreases

Question 10

liquid gas solid

Answer 10

liquid gas solid

Question 11

What is the total resistance of the circuit?

Answer 11

Less than 20

Question 12

Explain your answer?

Answer 12

• total resistance of parallel section is less than 10

- added to 10ohm resistor in series

Question 13

Explain how pf across resistor will change when switch is closed

Answer 13

• decreases pd becomes 0

- there is a short circuit across resistor

Question 14

Explain how pd across lamp will change when switch is clsoed?

Answer 14

current and pd increases

Question 15

gIVE ONE VARIABLE STUDENT SHOULD HAVE CONTROLLED?

Answer 15

Starting temp of water

Question 16

Half life question

Answer 16

1/2 to the power of 5

1:32

Question 17

Second half life question

Answer 17

-4.8 x 10 to the power of 3 over 94

= 5.1 x 10 to the 21

Question 18

Different people have different speeds at the end of the zip wire why?

Answer 18

• different people are affected differently by air resistance
• as SA varies

Question 19

lAST QUESTION

Answer 19

• energy given to water = m x slh
• since Bunsen burner = energy/time
• power= ml/t

Question 20

ohmic conductor

Answer 20

• in oc current and potential difference are directly proportional
• as resistance is constant
• occurs from 0-2V

Question 21

why not use maximum power?

Answer 21

• conserve fuel reserves

- reduce unnecessary environmental impact

Question 22

As speed increases efficiency increases

Answer 22

likely to be maximum efficiency

Question 23

how can uncharged object become charged?

Answer 23

• negatively charged
• electrons transferred
• from the object

Question 24

Which radiation

Answer 24

Beta

neutron has decayed into a proton

Question 25

explain how energy released by chain reaction is affected by moving control rods

Answer 25

• lowering control rods increases absorption of neutrons

- energy released decrease